本文選題：山東地區(qū) + 新元古代地層��； 參考：《山東科技大學(xué)》2017年碩士論文

【摘要】：山東地區(qū)新元古代地層土門群的分布局限在安丘—莒縣斷裂及西側(cè)附近地區(qū),巖性基本穩(wěn)定,下部和上部稍有變化。自下而上劃分為黑山官組、二青山組、佟家莊組、浮來山組和石旺莊組。膠遼徐淮地區(qū)中新元古代地層研究較為薄弱,缺乏可靠的年齡控制,生物地層學(xué)存在很大的爭議,化學(xué)地層學(xué)進(jìn)展有限。而這其中,山東地區(qū)中新元古代地層研究相對(duì)于遼南和徐淮地區(qū)又最為不足。本文主要依據(jù)前人資料和實(shí)測剖面,通過生物地層、事件地層和年代地層等,借助多重地層劃分的原理,研究山東地區(qū)土門群的歸屬時(shí)代。同時(shí)通過生物地層對(duì)比,事件地層對(duì)比以及碳氧同位素等方法與遼南、徐淮地區(qū)中新元古代地層進(jìn)行對(duì)比研究,以便更準(zhǔn)確的對(duì)山東地區(qū)新元古代地層的具體時(shí)代劃分提供證據(jù)。研究表明:依據(jù)巖石地層、生物地層、事件地層及野外實(shí)測剖面對(duì)比研究,認(rèn)為土門群上部時(shí)限有可能在720Ma,可以與遼南地區(qū)、徐淮地區(qū)新元古代地層比較分析,山東地區(qū)新元古代地層土門群可以被重新劃歸為青白口系。通過碳氧同位素實(shí)驗(yàn)并校正后主要得到如下數(shù)據(jù):湯頭剖面主要為佟家莊組、二青山組及黑山官組,其δ13C變化范圍為-5.59‰—2.17‰,均值為0.79±1.01‰,整體有正漂移后又有負(fù)漂移的趨勢。浮來山剖面主要為石旺莊組和浮來山組,其δ13C變化范圍為-2.14‰—2.36‰,均值為1.42±0.70‰,整體經(jīng)歷了由正漂移后負(fù)漂移后又正漂移三個(gè)階段。通過分析冰期碳同位素特征,土門群僅出現(xiàn)小幅度的碳同位素負(fù)漂移,其整體趨勢基本穩(wěn)定,變化幅度較小,曲線趨勢明顯與冰期特征及華南地區(qū)冰期前后不同,故認(rèn)為其時(shí)代可能屬于冰期開始之前。土門群二青山組下部有一個(gè)微小的正漂移,可與薊縣青白口系下部長龍山組處碳同位素正漂移相比較;土門群浮來山組下部出現(xiàn)的負(fù)漂移,可與薊縣青白口系上部井兒峪組碳同位素負(fù)漂移相比較�；幢钡貐^(qū)碳同位素整體變化趨勢為正—負(fù)—正—負(fù)—正,與土門群碳同位素整體變化趨勢相同。故認(rèn)為土門群可與青白口系對(duì)比。
[Abstract]:The distribution of the Neoproterozoic Tumen Group in Shandong is confined to the Anqiu-Ju County fault and the area near the western side. The lithology is basically stable and the lower and upper parts vary slightly. It is divided into Heishan formation, Erqingshan formation, Tongjiazhuang formation, Fulaishan formation and Shiwangzhuang formation from bottom to top. The study of Neoproterozoic strata in Xuhuai area of Jiaoliao is weak, lack of reliable age control, great controversy in biostratigraphy and limited progress in chemical stratigraphy. The study of MesoNeoproterozoic strata in Shandong area is the most insufficient compared with the areas of southern Liaoning and Xuhuai. Based on the previous data and measured profiles, this paper studies the time of belonging of Tumen Group in Shandong region by means of biostratigraphy, event stratigraphy and chronostratigraphy, and by means of the principle of multi-stratigraphic division. At the same time, through biostratigraphic correlation, event stratigraphic correlation and carbon-oxygen isotope correlation with the Middle and Neoproterozoic strata in southern Liaoning and Xuhuai areas, In order to provide more accurate evidence for the specific age division of Neoproterozoic strata in Shandong area. The results show that according to the comparative study of lithostratigraphy, biostratigraphy, event stratigraphy and field measured profiles, it is considered that the upper time limit of Tumen group may be 720 Ma, which can be compared with Neoproterozoic strata in southern Liaoning and Xuhuai areas. The Tumen Group of Neoproterozoic strata in Shandong area can be reclassified as Qingbaikou system. After carbon and oxygen isotope experiments, the following data are obtained: the Tangtou section is mainly composed of Tongjiazhuang formation, Erqingshan formation and Heishengguan formation, and its 未 13C varies from -5.59 鈥，

本文編號(hào)：2017815